Manufacture of blanks for nuts.



E. HOLLINGS.

MANUFACTURE OF BLANKS FOR NUTS.

APPLICATION FILED JAN. 24, I916.

Patented July 3, 1917.

.UN @TAT% PAN IIFFIQDE.

ERNEST HOLLINGS, OF SALE, ENGLAND.

MANUFACTURE OF BLANKS FOR NUTS.

Application filed January 24, 1916.

To all whom it may concern:

Be it known that I, ERNEST HoLLINGs, a subject of the King of Great Britain, residing at Sale, in the county of Chester, England, have invented new and useful Improvements in the Manufacture of Blanks for Nuts, of which the following is a specification.

This invention relates to the manufacture of nut blanks by machines in'whioh the bar of metal is indented by top and bottom tools at intervals just before the blank is cut off by the pressing plunger and pressed in a die; and is hereafter described with reference to the accompanying drawings whereon Figure 1 is a fragmentary face view showing parts of the indenters of a nut making machine, closed down on a bar of metal, according to my improvements, Fig. 2 is a vertical section showing the bar unindented, and Fig. 3 a

similar section between the points of the indenters showing the bar indented as in Fig. 1. Fig. 4 is a view similar to Fig. 3 but of an ordinary metal bar. Fig. 5 is a view in isometrical perspective of a metal bar aocording to my invention and showing in dotted lines the corresponding shape of an ordinary bar. The indenters a in partially cutting the bar tend to distort or thicken it at the points of the indenters, thus, with the ordinary bar, causing a nut-blank 0 to be of unequal thickness at the corners as shown in Figs. 4: and 5 and the nut is not flat on the faces, the corners at 0 and 0 being lower than at 0 0 which difference is not reduced by the subsequent pressing in the die. To avoid this defect and insure the indenters a giving the correct shape to the unpressed blank 0 I thicken or raise the parts 6 of the bar toward the edges while leaving the center part 6 approximately flat so that the thick ening of the center part Z) when being in- Specification of Letters Patent.

Patented July 3, 191?.

Serial No. 7 1,035.

dented by the indenters is as near as possible the same as the preliminary thickening at b of the edges. In this way all the corners of the nut-blank are of nearly equal thickness as shown in Fig. 3, and there is no waste owing to unsymmetrical nuts. The thin center part is thickened out by the usual hole punches. Also less power is required in pressing because it has been found that when the corners of the nuts are of unequal thick ness no pressure that it is practicable to use on the machine will press the corners into proper symmetry to make the faces of the nuts flat all over. The thickening of the bar is gradual from the depth to which the indenters enter to the outer edges, and for a nut with a half-inch tapped hole will be about 5/ 64L inch on each side, but this thick ening will vary in amount according to the nature and quality of the iron or steel and its malleability, being less for soft easy flowing basic steel and increasing through the various grades of mild steel and wrought iron up to steel that can be tempered.

I claim:

1. A method of manufacturing nut blanks of even thickness consisting in thickening the edges of a bar of metal, indenting said bar on the thickened edges at intervals, cutting ofl the blanks at the bottoms of the indentations, and pressing the blanks in a die, substantially as described.

2. A method of manufacturing nut blanks of even thickness consisting in thickening the edges of a bar of metal, indenting said bar on the thickened edges at intervals, and cutting off the blanks at the bottom of the indentations.

ERNEST HOLLINGS. Witnesses W. B. JoHNsoN, R. H. FISHER.

flopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 7 

